Ever hear strange noises coming from the attic, or scratching and chittering coming from behind the wallpaper? Chances are you could have mice, raccoons, or even squirrels in your home. As soon as you suspect the possibility of pests, get on it immediately. For smaller rodents, set traps. For larger, more stubborn intruders, calling a pro will be your best bet. To prevent future problems, seal up any entrances in your home.